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Fuel Pump Relay
I have what is likely a dumb question, but hopefully someone can help. I need to pull my fuel pump relay to do some testing I need to do, but cannot find the FP Relay! The Shop Manual shows the Fuel Panel in the trunk with the Fuses and Relays.
The Factory only list 3 relays near the main fuses in the trunk: (for my '74 911), the AC Relay, Fog Lamps and Signal Horn. There are blank positions for relays but since my 74 911 came with CIS, I would think there would be a FP Relay from the Factory, right? The Relays behind the gauges are 1- Vacant, 2 - Heated Windshield, 3 Emergency Flasher and 4 - Seat Belt Warning System. Also near the engine are Rear Window Heater Relay, 2 - Cold Start Relay, 3 - Relay for Single Stage Heated Rear Window Thanks! Larry 74 911 EFI |
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07-29-2019, 07:36 AM
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ROW '78 911 Targa
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No fuel pump relay in your ‘74.They were added as a safety feature in ‘76.
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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07-29-2019, 07:41 AM
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ROW '78 911 Targa
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If you need to test without the pump just unplug the 2 wire connector.
Here are the factory wiring diagrams. https://www.dropbox.com/sh/s292jtsyvl6llw2/AABF-ofgMfoMltGa99Asphr5a?dl=0
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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07-29-2019, 07:47 AM
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Registered
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Fuel Pump Relay
Thanks so much guys, I really appreciate the fast response!
LarryT 74 911 |
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07-29-2019, 10:15 AM
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Dennis, thanks for the help. I had a set of Flow Diagr that I notated over the years, but I downloaded the set you sent in case I was missing anything. Now that my relay question is clarified, is there a factory fuse for the fuel pump? I have looked at the info (Flow Diagr.) I have and it does not show one, but to me that seems like a bad idea. (like the lack of a relay)
Guess I may need to disconnect the 2 wire connector. Is that the connector that attaches near the top of the FP? It's been so long since I had to work on the FP, I've forgotten how it is connected. Thx, Larry |
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07-29-2019, 03:18 PM
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ROW '78 911 Targa
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No fuse, always energized with ignition on.
Follow the cable from the pump back. The T2 connector indicated in the schematic is what you need to unplug.
__________________
Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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07-29-2019, 06:44 PM
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Registered
Join Date: Jul 2018
Posts: 122
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There is a 2 wire connector in the engine bay; drivers side next to the shock tower by the sound pad. My 74 does have a fuse in position # 15 or 16. I will check tomorrow to be sure. John.
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07-29-2019, 08:05 PM
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ROW '78 911 Targa
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Factory wiring diagram shows fuel pump supply wire coming from the top of fuse 12.
Far left side below. (If pic is oriented correctly)  
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Dennis Euro 1978 SC Targa, SSI's, Dansk 2/1, PMO ITBs, Electric A/C Need a New Wiring Harness? PM or e-mail me. Search for "harnesses" in the classifieds. |
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07-29-2019, 08:22 PM
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Freddy
BEE
Heinz
